Sativa Records was formed in 2003 by YT, NJC, Digital and Gordon Mulrain who later became the fourth member of Sativa Records collective. In 2004 Clarkson & Mulrain joined together as NJC & Innerheart, and went on to produce 7 of the 13 tracks on Straight Outta Britain the debut album of UK reggae artist YT (Mark Hull, nicknamed Whitey). Clarkson was also introduced to 'Ola' from the then Stage One Music publishing company in London. Clarkson put together a sampler of several productions from various genres and sent over to Stage One Music for consideration. In the winter of 2003 he signed a 3 year publishing deal with Stage One Music. Stage One Music split and Ola founded 'The DML' (The Dance Music Library) which is part of JAL (Just Another Label) for which Clarkson still writes today.
At the start of 2004 Clarkson was commissioned to write a theme tune for PlayStation 2 game Dog's Life. The track was used on the cover-mount DVD in Europe for Official UK PlayStation 2 Magazine. The game Dog's Life was later released around the world and Nat's track was reported to have been used in the Southern Hemisphere for terrestrial TV adverts. Later Sony BMG agreed to an out of court settlement with Stage One Music, as they had not obtained the relevant license to use the song.
In 2006 NJC left Sativa Records to pursue his own solo projects but continued to write music for library and production companies worldwide.
In January 2009 Clarkson was approached by west London based trance producer and DJ Chris Grabiec. After a number of studio sessions together they established an outlet label for Grabiec's releases. Dance Regime was launched in the winter of 2009 with Grabiec's return to music production, with the single, Guardian Angel.
Ambiel Music was launched as a record label in April 2009 by Clarkson and Gordon Mulrain. The label was originally conceived as an outlet for their combined music productions and artists they worked with.
During 2010 Clarkson started to heavily develop his roster of artists for his music production company NJC Music, he currently works with Chris Grabiec, Charlie O'Neill, Voodoo Browne, Laura & The Boutique, I'm Just Happy and Kyra Ja'e developing music for commercial release and licensing.
In the spring of 2011 Clarkson completed dub step pop EP, The Industry, with Solihull based singer Charlie O'Neill  for Extreme Music (Sony/ATV Music Publishing), the EP was later signed to new label venture Hype Music, which is a partnership between Extreme Music and MTV Networks in the US.
The summer of 2011 saw NJC release his first Drum and Bass single in over 5 years, the free download single Cascades features Bass player and long time musical collaborator Mr Lee (The Marvelous).
Many of Clarkson's recent productions have been used across all major territories around the world in many mainstream television programs and adverts including Celebrity Big Brother, Hollyoaks, MTV's Jersey Shore & Geordie Shore, Made In Chelsea, MasterChef, Skunked TV, Fifth Gear, The Really Wild Show, America's Next Top Model, Miami Ink and CSI: NY.
Clarkson continues to build his roster and is focussed on the success of his artists and the music they produce.